/*
 * Copyright (C) 2020 Grakn Labs
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 *
 */

package grakn.core.graql.reasoner.state;

import grakn.core.concept.answer.ConceptMap;
import grakn.core.graql.reasoner.query.ReasonerAtomicQuery;
import grakn.core.kb.graql.reasoner.unifier.Unifier;

import java.util.Iterator;
import java.util.Set;

/**
 *
 * <p>
 * State producing AtomicStates when when atom type is unknown and type inference is required
 * </p>
 *
 *
 */
public class AtomicStateProducer extends AnswerPropagatorState<ReasonerAtomicQuery> {

    public AtomicStateProducer(ReasonerAtomicQuery query, ConceptMap sub, Unifier u, AnswerPropagatorState parent, Set<ReasonerAtomicQuery> subGoals) {
        super(query, sub, u, parent, subGoals);
    }

    @Override
    Iterator<ResolutionState> generateChildStateIterator() {
        return getQuery().expandedStates(getSubstitution(), getUnifier(), getParentState(), getVisitedSubGoals()).iterator();
    }

    @Override
    ResolutionState propagateAnswer(AnswerState state) {
        return new AnswerState(state.getSubstitution(), state.getUnifier(), getParentState());
    }

    @Override
    ConceptMap consumeAnswer(AnswerState state) {
        return state.getSubstitution();
    }
}

